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          <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; font-size: 12px; background-color: #ffffff;">Natural frequencies of double section beam, with mass at the top</p>
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          <p style="font-family: Courier New; background-color: #ffffff;">position of suspended mass from the top</p>
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          <p style="font-family: Courier New; background-color: #ffffff;">bottom column cross section area</p>
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          <p style="font-family: Courier New; background-color: #ffffff;">bottom column cross section inertia</p>
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            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">ELEMENTS STIFFNESS MATRIX</p>
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            <e type="operand">2</e>
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            <e type="operand">l.2</e>
            <e type="operator" args="2">*</e>
            <e type="operand" style="unit">m</e>
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            <e type="operand">4</e>
            <e type="function" args="18">mat</e>
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            <e type="operator" args="2">:</e>
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        <math optimize="2" exponentialThreshold="5" matrixOptions="0,0,4,4">
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        <text lang="eng">
          <content>
            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">SYSTEM STIFFNESS MATRIX</p>
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        </text>
      </region>
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        <text lang="eng">
          <content>
            <p style="font-family: Courier New; background-color: #ffffff;">function to assembly matrix</p>
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            <e type="operand">0</e>
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            <e type="operand">0</e>
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            <e type="operand">0</e>
            <e type="operand">0</e>
            <e type="operand">0</e>
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            <e type="function" args="2">range</e>
            <e type="function" args="3">el</e>
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            <e type="operand">3</e>
            <e type="function" args="4">merge</e>
            <e type="operator" args="2">+</e>
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            <e type="operand">K.21</e>
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            <e type="operand">4</e>
            <e type="function" args="2">range</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="2">range</e>
            <e type="function" args="3">el</e>
            <e type="operand">5</e>
            <e type="operand">5</e>
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            <e type="operand">K</e>
            <e type="operand">K.22</e>
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            <e type="function" args="2">range</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="2">range</e>
            <e type="function" args="3">el</e>
            <e type="operand">7</e>
            <e type="operand">7</e>
            <e type="function" args="4">merge</e>
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        <text lang="eng">
          <content>
            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">CONSTARINED SYSTEM STIFFNESS MATRIX</p>
          </content>
        </text>
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            <e type="operand">K.system</e>
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          <result action="numeric">
            <e type="operand">10</e>
          </result>
        </math>
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            <e type="operand">K.system_cons</e>
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        <text lang="eng">
          <content>
            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">ELEMENTS MASS MATRIX</p>
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        </text>
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          <content>
            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">SYSTEM MASS MATRIX</p>
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            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">CONSTARINED SYSTEM MASS MATRIX</p>
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            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">DYNAMICAL MATRIX</p>
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            <p>or better</p>
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            <p style="font-weight: bold; text-decoration: underline; font-family: Courier New; background-color: #ffffff;">NATURAL FREQUENCIES</p>
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